Duncan mcewing patbick



D. McE. PATRICK. ANTICREEPING DEVICE FOR RAILWAY TRACKS. APPLICATION FILED JULY IT, I917.

1 ,309,957. Patented July 15, 1919.

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ANTIGREEPING DEVICE FOR RAILWAY-TRACKS.

Specification of Letters Patent.

Patented July 15, 1919.

Application filed July 17, 1917. Serial No. 181,089.

' Union of South Africa, have invented certain new and useful Improvements in Anticreeping Devices for Railway-Tracks, of which the following is a specification.

The present invention is a fitting for preventing the creeping of railway rails, of that type in which a cam device is arranged to jam wlth the rail to an increasing extent upon movement of the rail.

A purpose of the invention is to provide a cheap and simple construction of such a device,- applicable more especially with a rail having a flat base, which can be used with the ordinary equipment of a track in which the rail is screwed down to a chair .or sole plate.

In the drawings, Figure I is a plan showing the device in use, part of the rail being broken away; Fig. II is a section on A A Fig. I; Figs. III, IV, and V are respectively an inverted plan, a side view and an end view of the device detached.

1 indicates a rail having a fiat base 2 and a web 3. Said rail is held down to a chair 4 by screws 5 which pass through holes 15 in the chair and engage a sleeper not shown. 16 is the usual raised ridge at the sides of the chair, on which the heads of the screws 5 bear. i

The anti-creeping device according to. this invention consists of a steel plate or block 6 pivoted adjacent to the rail and formed on its underside with a cam surface or surfaces engaging the rail base and such that as the plate turns about its pivot in the direction (indicated by the arrow B) in which the rail tends to creep, it ams with the rail.

For the purpose the plate is preferably formed with a hole 7 by which it is pivoted on a bolt 8 which is passed through one of the screw holes in the chair 4:. The head 9 of the bolt is positioned beneath the chair 4 and is somewhat pointed to sink into the sleeper and allow the chair toseat properly on the latter. The bolt is provided with a nut 10 for holding down the plate 6.

The undersurface 11 of the plate 6 is sloped up toward the corner 12 as shown in Figs. III, IV and V. It is also preferably roughened as indicaated by the scoring lines in said figures.

In practice the plate is positioned about as indicated by the dotted lines 6, Fig. I so that it rests on the ridge 16 and its slopedundersurface 11 bears on the sloping upper surface of the base 2 of the rail. The nut 10 is then tightened down. By striking the plate as indicated by the arrow C Fig. I the plate is forced to about the position indicated by the full lines of Fig. I and by Fig. II, the sloped surface 11 being caused to climb the surface of the base, so that the plate exerts a strong downward jamming force on the rail.

Any creeping movement of the rail in the direction indicated by the arrow B causes the plate 6 to rotate more and so automatically increases the jamming effect.

It is desirable to form the edge 13 also as a cam surface adapted to engage the web 3 of the rail. For this purpose said edge 13 is made of increasing radius, with reference to the axis of the hole 7 from the corner 12 to the corner 14:. The plate is so adjusted by its nut 10 that when its cam surface 11 has come to full bearing, the cam surface 13 also engages the web 3. In this way not only is an increased resistance to creeping brought about, but the plate affords lateral support to the rail which is useful at curves.

I claim:

1. The combination with a rail having a base, of a plate mounted for rotation about a vertical axis near to the rail and provided with surfaces substantially transverse to its direction of rotation whereby it may be rotated, and means to retain the plate against lifting, said plate being formed on its underside with a cam surface which bears on the upper surface of the base of the rail and such as, upon rotation of the plate about its axis, to exert increased downward pressure on the base.

2. The combination with a rail having a base, of a chair therefor. a vertical pivot member extending upwardly from the chair, a plate mounted for rotation on said pivot and provided with surfaces substantially transverse to its direction of rotation whereby it may be rotated, and means to retain the plate against lifting, said plate having a cam surface engaging the upper surface of the rail base.

3. The combination with a rail having a base, of a chair therefor, a screwed bolt extending vertically through a hole in said chair, a plate mounted for rotation on said bolt and provided with surfaces substantially transverse to its direction of rotation whereby it may be rotated, a nut on said bolt holding down the plate, said plate having a cam surface engaging the upper surface of the base of the rail.

4:. The combination with a rail having a base, of a chair therefor having a raised surface, a screwed bolt extending vertically from said chair between the base of the rail and the said raised surface, a plate bearing on the base of the rail and on said raised surface, and a nut on the bolt for holding down the plate, said plate having a cam surface engaging the upper surface of the base of the rail and a surface substantially perpendicular to the axis of the bolt, said latter surface engaging the raised surface.

5. The combination with a rail having a base, of a chair therefor, a bolt inserted upwardly through a hole in said chair, a pointed head on said bolt adapted to penetrate a sleeper, a plate mounted for rotation on said bolt and formed with a cam surface engaging the upper surface of the rail, and a nut on said bolt holding down the plate.

6. An anticreeping device for rails, consisting of a plate formed with a pivot hole near to one end thereof, a face of the plate transverse to the axis of the hole being sloped off toward a corner of the other end of the plate, providing a cam surface in a plane inclined to the axis of the hole and intersecting said face of the plate obliquely to its length.

7. An anticreeping device for rails, con sisting of a plate formed with a pivot hole near to one end thereof, a face of the plate transverse to the axis of the hole being sloped off toward a corner of the other end of the plate, providing a cam surface in a plane inclined to the axis of the hole and intersecting said face of the plate obliquely to its length, said plate also having the edge of the plate remote from the hole. formed as a curve of increasing radius, with respect to the axis of the hole, from the sloped corner remote from the hole to the other corner remote from the hole.

8. The combination with a rail having a base and web, of a plate pivoted adjacent thereto, and having cam shaped undersurface and edge, said undersurface and edge bearing respectively against the base and web of the rail.

In testimony whereof I have aflixed my signature.

DUNCAN MOEWING PATRICK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

